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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6745ed2f411635ee682d9b5bd935f8fee4334a2ae2acb24b69ac5d4646efa201' 
  AND token = 'Y3QzoEyBlRE5Iq3HjgYx1c6AusQaI1oWWCADlHHK1pA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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