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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5407f2399d5fe84e7f040408e5e5a42736b30d8aa6e8a3ced323c66af743ed7' 
  AND token = 'NT44Tr2vpeSG4Bq38+xUulbXy0RlMcdY4tM3b9FVRWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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