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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6ca71bb6aa9524009445cf815e856044ba9b321a48f3d180ace10e1f811269a' 
  AND token = 'njb4AhPCT6Wf6dlosrEruiuo5AW+vdFoW9+Pn9fY9Ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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