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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd12d9e9fa6e4e5ff49038b0f9949a7d306bedba546a777697ff9c97e4c90a290' 
  AND token = 'vjcvtnmXdGWbkYi3wPMe/BVAXD8B0S67ZZi9IthV7js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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