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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1104713b9c8ab29e2a35c19e7d8e270931b759e1285423fccd3c50bcfaff7bdf' 
  AND token = 'q4FlFoYOiRmtA14HtwTf7OwgEKGWr8hWiDSo5DIQB5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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