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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27792d6003008c5dc28ec140db6a6080bfc34c392eb8f8338ddb8effba98daf9' 
  AND token = 'MESoDzZR+fKhRaFe9Ro0Ak2Plwk3TaZmb2sFq+azwF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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