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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d2253d5d1fa5a63ef24952ea8d7edd8062ca63b709cf23f2b712c93d8901dc2' 
  AND token = '57VWmzIYKSTH5eX677kvPYIL5W2c0/sni+cUSn/Q9sM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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