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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17f1e0977dd329722f0b47a6281f5e2a5b8f78457fa6c048fbec7515582e9636' 
  AND token = '/dl4v8M3bh0XFFzFmpoCa4dhOOzxwKVZIklokfp/bvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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