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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '863a89e8dc47e87153c2595d52aefa765b887835c75660f53bab27c9e7704eed' 
  AND token = 'ibo/+dW71JTbeu8UEncEY09899GcjB50sk3r6JWPmNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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