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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da18da4e486c51fb81a6786ce52f1d2430f1a4005e3897cae2dfc0fb5d80de5b' 
  AND token = '+AwN6RvImAWVs3cWlMB/vcVG0woorAg7EpitC/oSk6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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