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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f020a4133c38a29513474c180987e7f97acdac4664a1b9202fad1bc91b358b3d' 
  AND token = 'uSdAWdIJ4cKoXKwazcgd0YX76gScA1eEoT7O7omDiD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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