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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f27ae5c9213afb921e3d3d70a1e747554e03ddc67f6b3a2c675e874f5b73c06' 
  AND token = 'MdGgzL2SnP6gTLr6UTbHhWaiGIUNYNadlhnrS+dDvqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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