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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42a15a8a90c2965adce72bf9db2fd3c3d92c121c5ae54f3c1a69641f2d6f840c' 
  AND token = 'bqLjOWMLj5a7CM0woZtlg7GkNfULy2AVtsUtgDq9U6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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