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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '973272503b7f422b82d346da202bac87eb1f40ee9c317af3de230ba7febfa28b' 
  AND token = 'kLnt0Zk/Bc0EIIKYpujaDO3eZidDw164uqprm6N7w8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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