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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba055f0365904dd7204983ca5afa6531c7bc16195c76977ff5cb0f01f5105918' 
  AND token = 'Mov5wJPS3g9NKjHhxJrxHsMtLELc5GelTdJiQCyQKPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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