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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be7a29a88a94b6986adb224f59ec0fff2f2b5f9a3038858b8aeb37395a46a657' 
  AND token = 'EfrHh7XeMp81V5HET5Xtm0WEqu4O/VNHSypS2aNvhTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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