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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8283043af75b2543fcd149777a777f7d66a438ca714e67ea306342ffbcb32154' 
  AND token = 'qsKTQIKW6h2H9UHo7CRI3qXSxnrOql7psvTVeeGBOCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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