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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0deea2ba12b6a4afa315ee885d0163b37eddf698458943db9e95ba46d89c926' 
  AND token = 'yEE8lM7ySEPDX+DJa9tZ7T23rAp7FmfIYY1OgAc/nZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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