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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b67ee5709a9f03604c515ca81248e9a4e90640e34ebe90802aa71e56f3349069' 
  AND token = 'cCjJb17l6Rs4wHGv3GB3smQcYHxAVSrjQ3yDbmDAofs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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