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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1fde3167e9c301b44741b3501de04441c3fa96a808b13fbcd7189bea8d06424' 
  AND token = 'CBg14DR8rxXD6qllzMsp5LIRJS27mikpTqviTy7G90k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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