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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cf99abf92edc07fcdfa6dd466bcd3b8c6f9f61bc60676480c66f48574b593f8' 
  AND token = '73elhkxpKTu3y/0ZEWc80bsodCEq5jkonSDZHVkxaoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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