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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6cc7cc0d54c790b258cbbac0c6e3c767a7e2fc666bd1005b8dbb6de7a16234c' 
  AND token = 'ajmcB6+AJfuBvRmda1USx5Xd/eeLdFlsIBar0VcZG+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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