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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbf69fd28782774d2201a7bfc1527329d737ba082b9eb11a85ce7443dff77c96' 
  AND token = 'h33c2HEHRxA03HPr1YL/qGV83S+80jZG1mrq1ACk2QQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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