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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '009a3c84001ecc9a1fbc68f7d91885bf84c0c7d0a88696c581bb1b0c78c0606b' 
  AND token = '5KOZ7JJ/dUS7pn6NC7Q4F5Y8CehDqYslhsc4odI+7l4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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