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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '999a07fb94bf8cc31d952a46e0b7dc88134188580ca1171e1cfc422c1f74b6e8' 
  AND token = 'kvwKOrHuBSVsAKo6PyXfk8K7rmNcsipArMglKpvZH6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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