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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd3ce0e8b2817afba2768a7c20125b54a4398567abff1fb6c3602f9ee841675f' 
  AND token = '6geGxBClINS/Nd3lobSZOENyfRrORXZsoD6jEJE1FN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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