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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28fda80c6e0430b31a79a186376303b30589a6bc3823d7a8f95e9847fda42de8' 
  AND token = 'lqq6n/5LYi4u7GLFYcGhZ7X4WDRVhh7MakIYXustqfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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