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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ede300954ad2027fc6a25c810377ba6c7aa6a5e12ccc54e6dceb6a5b3d8f3c19' 
  AND token = 'N6ZyKI/DZARuJaxk6ipvTGmS9YFNKEEiUgXqYbOLdg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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