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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '611ae48ec105fc208f7928249412ba19aaf5977d25cc5ceffca491c8c0a0f002' 
  AND token = '/Jb53LC86MhhGPblWFdpijI2SN79BCXKYYBf45V29NQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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