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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dbc7c634e5f779e1d7cc8223162781b25c89ae41f793b05ff945959d608599d' 
  AND token = 'F1k20IP9NcdElu4xbIR9EJRRB7cXc3hEXncOKhY0gMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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