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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca1386c0993571521af9fbf2a02ba692117092a7e700ee4deaa17127f509ed47' 
  AND token = '5AquD7CrrAdLHbil8JbBqRa/RfgdgEeDnqUcPlXX/HM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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