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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2e6767bf1af0ba50dda25a0ed48a0dfb808ecfad8ba98e2994172a09410dae6' 
  AND token = 'rDS3qjpJfUIlt7088rHqMV3kn00jO7WEof9Ti+T3Wfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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