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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68372cfca8dfca6242bb39f7244a62e811fc7e62294a93b4926610cda97d32b3' 
  AND token = 'pMdST9aFd5BisIyO5eqyM1yjMxseCBAMXiLhuE2emoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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