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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d603647b762b0ab028fd469769bddc21f73a83c2b367f2498d894bb41170561' 
  AND token = 'vV5KH6lWx031+vN6j5zKBNOAUTLncnPme7dOEfUb4eM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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