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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '200cd5a40e09ed7a87502f4ff277ae4a82d8b2897774369e05b4daac7eeb4f4d' 
  AND token = 'hntvwBdVFuc3eYAXNvKXltteFF4n9gk6yJsg7MJJ/4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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