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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7d7a41bf326ec4aef87482532f9398c77fe7f3d0cbd972640ab7dd08a36f24f' 
  AND token = 'ZQk8ScOweriWIpNFB9/QrTTld2hCgSBmRFd/0zcM2cI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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