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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2b0e25ed68dbe4a81e0690ed0706d162e6fc1924ec372689edc29f6ecffffae' 
  AND token = 'bJ1wS82yV8+uXHTHhtVdUh99fS5x7NIUvrFH/bmff9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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