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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9e764dabce9f02867fa7363aceac6d4d6554186b6ee132b000eb785430ed2a6' 
  AND token = 'y+/AYrsx0DhwUzuJ193r/0qoLfLev+LzU3bCcv/zdcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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