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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ef8141bd375d3fcc650f371e8da03aceacf8a7039e2f0c347cbf0839a81ad9f' 
  AND token = 'nIqS/RZVEErMZ83iILQEr2VM88nOHJgMd1mWT9Ra7H8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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