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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6a238225b97504b6368d919ec920ca99b3744412c97ebacfb834c4ccf91d853' 
  AND token = '8maVXtJBIyFN8WI7GNGk8MrqJnOOlLibZKxFHZ+5Ku4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00199

JSON explain

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