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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b02b7ea0dd6ee63f563c8a92c0eadac60d614a0fb77334e4c895f1bb56bb662' 
  AND token = 'LBFhG3/cFohjCDT9SPkRzbb2p0kvqHiaruqdy0DS46E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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