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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dafc339144b9b574dd1148c89f5527e75662170702f4c85880c931c08c9f24e' 
  AND token = 'uQ/J+eaGmVkWjXsby2zyh1ueEn8bXod+67wAU7IWDzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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