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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '962060c4b244286b7f5a89d3a56ec649c30f8c464dace0bb8d34c4f6793e67f6' 
  AND token = 'Ib37h6FZQ3T0MA+8rDpFCq3LyQaAyROWzFC+tGSGWuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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