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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9057574d04cfd094d5fb5a9b2ad5cb0fcdc99585160c617154f343e9a08df51f' 
  AND token = 'OFd4teuSMjBKLCH8WRyiH+M7GSpGhSRBUUq7jzIVnEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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