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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd670c5311193b5623e0321e4c77cc450531972c980b3dce8c7fc6b19da014166' 
  AND token = '9z/HcVLcMwNek9PG7yZIOm0a3AO3nI5jERgCtfYQKqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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