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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f7b73994218d7ffc9b7f23090e718f693d12595ea54787ad13f3cf73c274d62' 
  AND token = 'Aw9rtMSNYgfMKnhp5hyFBT6W0sL/i4InzKanu2Ak15s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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