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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7706c97abe09445b2bc4ee8abdecddd8be5504fcf09bc1e38dc3bf6d8b15ba16' 
  AND token = 's84E0SZOUHNGF8FWMDRQLIILed28LjS6yZFfJTQWSno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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