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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5d3dc2d90c40cff6e504680f5a9b870bdb915cf5caa44b74c88e63e7ad46309' 
  AND token = 'XNfZyy7Vx30yAkVv6SGwdK+ygcLiGtvNqslc2daBMdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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