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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8408f6da8e5723e7a93dcf2e2c5eac3cc50dd97ee2bfd65df31b10ad54b11db2' 
  AND token = '0Wo3V2Zz5vx7E0Wq70mzVa4Wpiy5O4gutEHd//yZ1nI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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