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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bc5803ee829cc596f0456b9a8212facfa1726d3bb711e537630d195d05556da' 
  AND token = 'scA1+yAOHhoV/pxIax7t2lJyVfFHkLreWl8QbXoXnf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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