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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b3a74f5811e9d747f3138bbb2db9a7f8db67520d5de3c80c310a6bbd96762c3' 
  AND token = 'zcPgjyeujCY0eKFVdSAdn0kvTfW3cnJtXq1uJSQm2HI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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