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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8510cbf4ef41d422c1b939e34b4d71ba6de3dabeeb1ebcf1e063c0e1306b1c1e' 
  AND token = 'sio4lNxojfAiJm3sb9K9s7/0IoeFaIoGsnSfDV0d5tI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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