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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd5ab878b8bd76a90efb692d242cd4d98e7871b2fbde5471e3235ef3f2db17b7' 
  AND token = 'WwMCm/ZBqG4M5xl6Ft2uPzb7MpePQl7XwksS0zZHtmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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