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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e239dde43199682f9f63f8a5141e0cdef665394e5db30e3d2e6ee98b51ef0fd0' 
  AND token = 'VgAEotxplBsVGye4xB7cBuQi1AYnStnjN7KpeDMcLts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}