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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c908acebbd739b0e1bd554aa5f40b6ac1ce628aa729ef1b5c0caac5a66e3642' 
  AND token = 'AjXgI+kaXPyDsFD4ZzQD3abMQ9rtyqzdP1MYhCTmO2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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