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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6175408fd0f65a11825f5f86fdebd554479d3caf70a4c0cb5d4b781365185fd4' 
  AND token = 'cMsVjbYnfTCDrFTtZyf4E9LWgknrgJz4j8jcfKd0ehU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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