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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17b67943881a0b443447e030e8ea7125c0957d3952083b112000839767eb36d5' 
  AND token = 'PQdYIpXx7D39Z6VWPwGZGIfNTE8Auz18pdVPzF6hrMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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