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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72461ba06409d579c18c3f0871738972e52eb1d3c72b24e9a9dc238a353e46f3' 
  AND token = 'ThlOhXIp1duxeNP1YRnrput7LPTsFC1/t4HPF76mQzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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