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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '689c8f7194f38d8c9e3d018d1c0b2be238c95925586166b1ee3411fa828d04dc' 
  AND token = 'lyanoYBXCSRoOPH0g39zlCYzn1J10odJGmkP6PTYoPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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